Delta Air Lines is the most reliable airline on the PDX to SEA route with a 93% on-time rate, compared to Alaska Airlines at 85%. Based on 1,426 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: PDX to SEA
Portland to Seattle — airline reliability comparison
On-Time Rate by Airline
Delta Air Lines93%
SkyWest Airlines86%
Alaska Airlines85%
PDX to SEA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 93% | 0.5% | 96m | 1,426 |
| SkyWest AirlinesOO | 86% | 0.5% | 63m | 12,352 |
| Alaska AirlinesASWorst | 85% | 1.4% | 51m | 5,720 |
Route Overview
87%
Overall On-Time
61m
Avg Delay
0.8%
Cancel Rate
19,503
Total Flights
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Data last updated October 2026. Source: Bureau of Transportation Statistics.